1993 Chevy Suburban dies while driving

DEANH

MEMBER
1993 CHEVROLET SUBURBAN
V8
4WD
AUTOMATIC
197,000 MILES

Just changed fuel pump and filter. 1st drive after replacement it died again after about 10 minutes. No fuel at injectors when trying to restart again. I read in your forum to check coolant temp sensor and or plugged cat converter. How can I tell if my cat is plugged? If the coolant temp sensor is bad, does this shut off fuel to the injectors when trying to restart an already warmed up car? Your help is much appreciated!

1 Reply

PEAR69

MECHANIC
1,482 POSTS

To confirm a blocked cat. You have to do an air flow test. Normally this must be done at a garadge that has this tester. The coolant temp. Sensor will not shut down a running engine, but if it is bad or the engine is overheating, it will not allow it to start. It is too hard to test this sensor and it is not that expensive - so if you suspect the CTS, just replace it.
Why did you replace the old fuel pump? Did you test for fuel pressure? If so, what was it?
Did you replace the fuel pump electrical connector when you replaced the fuel pump?
Also, the fuel pump ground could be the whole problem. This ground connects directly to the frame cross member - just before the fuel tank. It is the black wire that breaks out of the fuel pump harness -- look close you'll find it. This ground corrodes and causes all kinds of fuel pump issues. I suggest disconnecting this ground and totally re-doing this termination. Put a new crimp on this ground and clean up the connection real good. Test for voltage at the fuel pump. Keep us posted